When it comes to whether an animal is going to be a problem, I have found that horns and gender make little difference. It's all about personality. A neighbors wife was nearly killed because she got between a cow and her calf. I've had male goats, bulls and sheep with and without horns and they have been absolute sweethearts. Same with roosters. I've had female cows and every other kind of four leggeds and wingeds that were nuts. What I've learned over the years is the number one first rule is that none of your animals must ever be allowed to get over on you. You can never act afraid and you can never let them be boss. You must always be the herd or flock alpha (So must your partner and kids). You are probably going to get hurt if you do the wrong thing or act afraid. Animals can tell by the way you move, or act, or smell. If you are going to be afraid, you probably shouldn't have that kind of animal.
As to the particulars to your question, You can buy, or "rent" or take your animals to someone else's farm for breeding. Whatever you do, I believe you
should try to find the best behaved animal you can find. I've always kept and bred animals in part according to personality. I don't know for sure that personality is passed on. But it has always seemed to me that along with confirmation, intelligence, growth rate, milk production, behavior is also often passed on. And I simply don't want any bad behavior or danger on our farm. If somebody acts up, the easiest thing for me is to
sell them off. And, so far, I haven't been butted, or kicked or pecked in 40 years. As for age of animal effecting taste, we've never had a problem, but common consensus is that boars get a taste after 1 year, a billy after 1 1/2 or two years, and rams -nobody has ever said anything, but I suppose they might begin to get a bit randy about the same as billies. I think it is mostly a smell/age issue at the auction houses around here. They don't want to take any chances, so they sell for use according to age.